I've spoken out strongly before on the forum against RPs that contain rape. Personally, I don't think its an appropriate subject for gameplay and I don't like to see it. But, equally, I'm not going to force my sense of morality on someone else playing in a fictional virtual world if they want to create a really evil villain.
Why? I think the contrast between the brutality of medieval warfare and life and the chivalrous code is a large part of what makes the setting interesting.